Fishing – trapping – and vermin destroying
Patent
1996-02-26
1997-11-25
Niebling, John
Fishing, trapping, and vermin destroying
437217, 437220, H01L 2160
Patent
active
056912420
ABSTRACT:
A method for packaging an integrated circuit begins by providing an organic substrate (310) having at least one device site (312). Within each device site, one or more electronic devices (532) is mounted. Around the device site, slots (316) and corner holes (318) are formed. In one embodiment, a negative feature, such as a notch (326), is formed in the substrate along the inner edge (315) of the slots. After the electronic device is mounted and encapsulated in a plastic package body (320), the device is excised from the substrate by punching corner regions of a final package perimeter (317). The placement of the slots, corner holes, and notches results in a punch periphery that is free from burrs, provides maximum active interconnect area, and minimizes surface and/or edge damage during the punch operation. Instead of forming notches, a positive feature, such as a protrusion (426) can be incorporated into a punching tool segment (428) to provide the same benefits.
REFERENCES:
patent: 5067229 (1991-11-01), Nakamura et al.
patent: 5403785 (1995-04-01), Arai et al.
patent: 5429992 (1995-07-01), Abott et al.
patent: 5633205 (1997-05-01), Tsuchiya et al.
Bigler Charles G.
Nomi Victor K.
Pastore John R.
Bilodeau Thomas G.
Goddard Patricia S.
Motorola Inc.
Niebling John
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